Improvement in rotary pumps



'A'. NOTEMAN. Rotary-Pumps.

Patented lain. 29,1878.

FIG

FIGS.

N- PETERS, FHOTO-LITHOGRAFHER WASHINGTON. D. C,

UNITED STATES PATENT OFFICE.

ALONZQ NOTEMAN,

or TO LEDO, O HIO.

IMPROVEMENT m ROTARY PUMPS.

Specification forming part of Letters Patent No. 199,737, datedJanuary29, 1878 application filed April 28, 1877. p 7

To all whomct may concerm' Be it known that ,I, ALONZO NOTEMAN, of thecity of Toledo, in the county of Lucas and State of Ohio, have inventeda new and useful Improvement in Rotary Pumps, which provement is fullyset forth in the following specification My invention relates, toimprovements inrotary pumps, the nature of which will be fully explainedby reference to the accompanying drawings, in which- Figure l is a sideview, with the end plate of the casing removed. Fig. 2 is a verticalsection. Fig. 3 is one of the guide-plates, with the position of thepistons in section shown, and Fig. 4 is one of the pistons.

Av is the casing, within which are placed -the operating parts of my.device. B is'the abutment. O is thepiston-head, divided bycross-channels G O, placed at right angles to the axis of thepiston-head, the whole being se cured firmly together by suitable boltsor screws, as shown. a

The abutment B is made semicircular in form, and so that it fills aboutone-third of the inner space or chamber of the casing. Its ends orpoints B are made to extend past the vertical diameter, as shown in Fig.1, thus occupying more than half the inner circumference of the casing,by which construction the curved or cam surfaces B engage and move thepiston,

and open the discharge-port before thewater between the engaged pistonand that immediately following shall have made a half revolution of thecasing, thus relieving the friction and creating a vacuum, anddischarging the water at a much earlier period than is accomplished inordinary devices of this class. The abutmentB covers, and hasformedthrough its ends water-passages communicating with Fig. 1.

B? is a semicircular recess, formed in the face I of the abutment B. Itextends between the inner or adjacent sides a a of the ports A A and itis adapted to fit snugly over and cover nearly one-half of thecircumference of the piston-head O.

The piston-head O has vformedthrough its center, and at right angles toeach other, the vertical channels O 0 ,111 which the sliding pistons E Eare placed. It is rigidly secured to the head or guide plates D D,which, for greater firmness, are recessed, as shown at D, Fig. 3; and itis journaled centrally in the casing, with one side fitting snugly intothe recess B The head-plates D D are provided with suitable journals,which are seated in bearings in the outer plates A A one of the journalsbeing extended so as to.provide a shaft for making connections withother machinery. They are made a little larger in diameter thanthediameter of the inner circumference of the part A and have their rimspacked in a rabbet or head-plates D be not recessed for the reception ofthe end of the piston-head, as hereinbefore described, the channelsDtwill extend entirely across the plates 5 but otherwise, they willextend only from the circumference to the recess D The latter, beingformed the same depth as the former, makes the channel substantiallyentirely across.

E E are the pistons, made in the form shown, and, divided into the twoequal parts E E, each part being composed of the horizontal and verticalwings E E The valves, being divided in the middle,rwill be extended or.contracted, as required, to preserve a perfect packing against the wallsof the casing and the abutment B. In the cross-movement of the valvesthe sharp corners of the contiguthe ports A A, as indicated in dottedlines, 7

. suitable holes a in the horizontal wings E which preserves thebearing-edges of the wings in the same line, andtat the same timepermitsa free to-and-fro movement thereon of one or both of the halves. In oneof the holes '6 I place a spring, 6 which, acting on the free end of thepin 6, will force the wing or half E outward, and pack the piston firmlyagainst the walls of the casing and abutment. By the foregoing it willbe seen that I am enabled to employ two pistons, crossing each other,with capability of extension, and sliding in crosschannels formedthrough the piston-head G, thereby giving me all the advantages of apiston made solid or in one piece, and of a piston made with capabilityof extension.

When the head-plates D are placed in position, with their rims properlypacked-in the rabbet or groove 01, as hereinbefore explained, and theend plates A A are bolted on, as shown in Fig. 2, it will be seen thatthere is made a water and air tight chamber within the casing, the onlyopenings being the ports A A thereby providing a perfect vacuumchamberfor the action of the pistons.

' It will be further seen that the valves E are in the channels D withcapability of a free and steady to-and-fro movement, and that the greatamount of friction consequent from the extended surfaces of the sides ofthe pistons bearing against the sides of the channels 0 is obviated, andthe pistons are not so liable to become worn and inefficient bylong-continued use.

By inspecting Fig. 1 it will be seen that any given piston is neverpacked between the walls of the cylinder A but is always packed betweenthe wall of said cylinder and the face of the abutment B, or between thecam-surfaces B It will be further seen, when one of the pistons isbrought across, so that it will receive the full force of the waterflowing in through the suction-port A, that less than a half-revolutionof said piston will bring it round to and partially open the dischargeport A which partial opening will relieve the friction of the water,which has by this time expended. its force behind the piston.

By'reason of the great amount'of friction obviated by the constructionof my device, I am enabled to furnish a pump which can be operated witha much slower movement than, and with improved results over, theordinary rotary pump. 1

The pistons are moved by the positive ac-' tion of the cam-surfaces, noreliance being placed on gravity as amoving force. The pistons are keptconstantly packed, so that all noise and clatter are avoided. Betweenthe suction-port and discharge-port two pistons are always closelypacked with a vacuum in front of the forward one. The piston being movedby the cam-surfaces into position, no friction, except that caused bythe packingspring a is made on the face of the recess B, so that theabutment within this recess does not become worn so as to form anunprotected passage over the piston-head, through which air could passfrom the discharge-pipe back to the piston at the suction-pipe.

The end of the abutment may be hardened by any well-known process, so asto prevent wear of the cam-surfaces B Or these ends may be formedseparate from and closely fitted to the abutment by any suitable meanswhereby they could be removed when worn, and replaced by others.

I do not claim, broadly, the construction of a casing with an abutmentagainst which the piston-head revolves; nor do I claim, broadly, theconstruction of pistons adapted to move across each other in channels inthe pistonhead, as such constructions are old and well known; but

Having described my invention, what I claim, and desire to secure byLetters Patent, 1s-

1. The semicircular abutment B, constructed with the recess B andcam-surfaces B and having its ends or points B extended past the centralline or'diameter of the cylinder A and having through it water-passagescommunieating with the ports A A and the inner chamber of the casing, incombination with the piston-head O and pistons E, substantially as setforth.

2. In a rotary pump, the head-platesD, constructed with theguide-channels D in combination with the piston-head O and pistons E,for the purpose set forth.

In a rotary pump, the pistons E E, constructed as described, and dividedinto the equal parts E E and held in line by the pin e in holes 6 andprovided with the springs 0 and placed so as to move at right anglesacross each other, in combination with the pistonhead 0, having channels0 0 formed at right angles to each other, and head-plates D, constructedwith channels D substantially as set forth.

4. A rotary-pump casing, A, constructed ALONZO NOTEMAN.

Witnesses:

E. H. RHOADES, W. T. RYAN.

